World number one Aryna Sabalenka was defeated by Russia's Ekaterina Alexandrova in the fourth round of the Canadian Open in Toronto on Saturday. The upset came as a significant setback for Sabalenka's preparations for the upcoming US Open.

The 16th-seeded Alexandrova secured her quarterfinal berth after a hard-fought match that lasted nearly two and a half hours. The victory marks a notable achievement for Alexandrova against one of the sport's top players.

Sabalenka, a four-time Grand Slam singles champion and the reigning US Open winner, managed to recover from losing the first set. However, she was ultimately unable to overcome Alexandrova's aggressive play in the deciding third set. The match concluded with a double fault from Sabalenka on the third match point.

Alexandrova, speaking after the match, emphasized her focus on playing each point with maximum effort. She acknowledged the limited opportunities against a player of Sabalenka's caliber and expressed her happiness at securing the win, especially after feeling that her chance might have passed in the second set.

The loss for Sabalenka continues a pattern of challenging performances in recent tournaments, despite her top ranking. Her defeat in Toronto raises questions about her current form as she aims to defend her title at the US Open later this month.

Alexandrova's next opponent in the quarterfinals will be Ukraine's Elina Svitolina, who advanced after defeating American eighth seed Amanda Anisimova. The match between Alexandrova and Svitolina is set to be a key fixture in the later stages of the Canadian Open.

This result also comes amidst ongoing discussions in women's tennis regarding player eligibility and testing, as highlighted by recent news from the WTA concerning gene testing for biological sex. While not directly related to this match, it forms part of the broader context surrounding the sport's current landscape.

Sabalenka's journey at the Canadian Open ended abruptly, leaving Alexandrova to continue her quest for the title. The focus now shifts to how the world number one will regroup and perform at the final Grand Slam of the season.